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Finding the Fourth Proportional to 385.16, 577.09 and 261.60

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Solution

The fourth proportional to 385.16, 577.09 and 261.60 is: 391.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.16 : 577.09 = 261.60 : x
  2. Step 2: Convert to fraction form
    385.16/577.09 = 261.60/x
  3. Step 3: Cross multiply
    385.16x = 577.09 × 261.60
  4. Step 4: Simplify right side
    385.16x = 150,968.67
  5. Step 5: Solve for x
    x = 150,968.67/385.16
  6. Step 6: Final answer
    x = 391.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.